Apple scab first appears as small, olive-colored lesions on the undersides of the leaves. As the fungus spreads, the top sides of the leaves develop lesions, as well, that may become black or mottled with defined edges. Severely infected trees may become defoliated by mid-summer, making the tree vulnerable to other diseases. The fruit develop black or brown scabs or soft areas.
cytosis. [ 1 sÄ«tÅâ²sis] 2  a condition in which there is a greater than normal number of cells in a tissue or organ.
Apoptosis, in contrast, is a mode of cell death that occurs under normal physiological. conditions and the cell is an active participant in its own demise (âcellular suicideâ). It is. most often found during normal cell turnover and tissue homeostasis, embryogenesis,